The EC-47 missions began in 1966 with operations been conducted by the 360th, 361st and 362nd TEWS crews operating out of Tan Son Nhut, Nha Trang and Pleiku. By the early 1970's the units had removed themselves to operating out of Nakhom Phanom and Ubon air base in Thailand. The operations of the EC-47 Mission Crew was the intreception and destruction of enemy electronic signals originating out of zones outside of the recognised war theatre (Laos, Cambodia, China). Information from the units was also utilised for the direction of US Special Forces Missions and bombing missions and POW Rescue by the SOS Squadrons.